<template>
	<view>
		<!-- 使用自定义的搜索组件 -->
		<!-- <my-search :bgcolor="'pink'" :radius="3"></my-search>	 -->
		<my-search @click="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧的滑动区域 -->
			<scroll-view scroll-y="true" :style="{height:wh+ 'px'}"  class="left-scrool-view">
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['left-scroll-view-item',i===active ? 'active':'']" @click="activeChanged(i)">{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧的滑动区域 -->
			<scroll-view scroll-y="true" :style="{height:wh+ 'px'}"  class="right-scrool-view" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!-- 二级分类的标题 -->
					<view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
					
						<!-- 当前二级分类下的三级分类列表 -->
						<view class="cate-lv3-list">
							<!-- 三级分类的item项 -->
							<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3"
							@click="gotoGoodsList(item3)">
								<!-- 三级分类的图片 -->
								<image :src="item3.cat_icon"></image>
								<!-- 三级分类的文本 -->
								<text>{{item3.cat_name}}</text>
							</view>
						</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				//当前设备可用的高度
				wh:0,
				cateList:[],
				active:0,
				//二级分类的列表
				cateLevel2:[],
				scrollTop:0
			};
		},
		onLoad(){
			const sysInfo = uni.getSystemInfoSync()
			this.wh=sysInfo.windowHeight-50
			this.getCateList()
		},
		methods:{
			//获取分类列表的数据
			async getCateList(){
			 const {data:res} = await uni.$http.get('https://api-hmugo-web.itheima.net/api/public/v1/categories')
			 if(res.meta.status!=200) return uni.$showMsg()
			 this.cateList=res.message
			 
			 //为二级分类赋值
			 this.cateLevel2=res.message[0].children
			},
			activeChanged(i){
				this.active=i
				
				//重新为二级分类赋值
				this.cateLevel2=this.cateList[i].children
				
				//重新赋值scrollTop 如果为相同的数则不会变化
				this.scrollTop=this.scrollTop == 0 ? -1 :0
			},
			
			// 跳转到商品列表页面
			gotoGoodsList(item){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
				})
			},
			
			
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
.scroll-view-container{
	display: flex;
	.left-scrool-view{
		width: 120px;
		.left-scroll-view-item{
			background-color: #f7f7f7;
			line-height: 60px;
			text-align: center;
			font-size: 12px;
			&.active{
				background-color: #FFFFFF;
				position: relative;
				&::before{
					content: '';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #c00000;
					position: absolute;
					top:50%;
					left: 0;
					transform: translateY(-50%);
				}
			}
		}
	}
}

.cate-lv2-title{
	font-size: 12px;
	font-weight: bold;
	text-align: center;
	padding: 15px 0;
}

.cate-lv3-list{
	display: flex;
	flex-wrap: wrap;
	.cate-lv3-item{
		width:33.33%;
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
		margin-bottom: 10px;
		image{
			width: 60px;
			height: 60px;
		}
		text{
			font-size: 12px;
		}
	}
}
</style>
